Helmet



FIG. 1 is a front right perspective view of a first embodiment of a helmet comprising the new design shown in a typical environment by phantom lines for illustrative purposes;

FIG. 2 is a front elevation view of the first embodiment;

FIG. 3 is a right-side elevation view of the first embodiment, the left side elevation view being a mirror image thereof;

FIG. 4 is a rear elevation view of the first embodiment;

FIG. 5 is a top plan view of the first embodiment;

FIG. 6 is a bottom view of the first embodiment;

FIG. 7 is a front, right perspective view of a second embodiment thereof;

FIG. 8 is a front elevation view of the second embodiment;

FIG. 9 is a right-side elevation view of the second embodiment, the left side elevation view being a mirror image thereof;

FIG. 10 is a rear elevation view of the second embodiment;

FIG. 11 is a top plan view of the second embodiment; and,

FIG. 12 is a bottom view of the second embodiment.

The broken line showing of a helmet is for the purpose of illustrating environmental structure and forms no part of the claimed design. 

CLAIM The ornamental design for a helmet, as shown and described. 